Friday , June 24 2022

Scientists say the edge of the galaxy is hiding a gigantic ghost galaxy British media: there is still an unsolved mystery – International Online


The reference news network, published in the British press on November 24, said that behind the dust and gas disc that made up the Milky Way, people were a ghostly galaxy that seemed different from the other galaxies they had seen before. Or at least some astronomers said – but another researcher questioned his findings.

As the British "New Scientist" reported on weekly basis on November 16, the newly discovered dwarf galaxies were about one-third the size of the Milky Way. In the constellation of Antria, it is 450 million light years away from the Earth. This is called "Antelia-2" – or "Ante-2".

Researcher Gabriel Torealva said: onu They look like some galaxies around the Milky Way. We know they've been around for years, but they're about 10 times the size of galaxies, and the brightness is being distributed to the sky.

According to the reports, he and his team caught the bright star "Ante-2", called RR Lyle, and the bright stars of RR Lyle shake, shine and darken for a long time. As you know, almost every small galaxy surrounding the Milky Way has at least one sign that works simultaneously with the stars around.

Big Ghost

According to the report, Torre Yarwa and his collaborators used the four RR Lyle stars observed by Gaia to monitor the location and movements of the nearby stars and to map the Milky Way and its surroundings. The team found that the flickering cluster of stars was moving together.

In the report, it was found out that the four RR stars were measuring the light of the red giant star and moving around the same speed and belonged to the same galaxy. These stars, however, show that their galaxies are strange.

Based on distance, the research team concluded that "Ante-2" was spread over an area of ​​approximately 9,500 light-years. But for such a great galaxy, it is extremely gloomy. This is because the diffusion range is 100 times greater than the hyperfraction galaxy. This means that the surface brightness of the "Ante-2" has the lowest known star systems.

Torre Yalva believes that this can be caused by the dark matter of the Milky Way. As with most galaxies, "Ante-2" can be evenly distributed rather than concentrating at the center. This may allow the v Ante-2 ”to retain its enormous volume in the event of mass loss due to the gravitational effect of the Milky Way.

Strange galaxy

However, Gisela Clementini of the Italian National Institute of Scientific Astrophysics said that before answering precisely how extraordinary the features of "Ante-2" were, some questions should be answered. He examined the RR stars observed by Gaia and noted that there was a mistake in the formula used by the Torreyalava team to calculate its distance to "Ante-2".

When she realized this, she asked her to collaborate with collaborators in Bologna and Naples, all of whom thought there was a problem with the distance measurement. This is a serious problem because the features of this galaxy are very unusual only when the galaxy is too far away from Estai's team predictions.

Clementini, the team to remind you to pay attention to this issue and that they agree to re-analyze, he said. He said: "They found something, but at this stage, I can't bet on any features of the system unless I can verify the account."

Clementini said that the RR Lyle star might not belong to the galaxy, but it could be in front of the galaxy. In this case, the research team found that "Ante-2" was pure luck. If the distance of the galaxy is farther than we thought, the dimensions will be much more. But if it's closer, it's like an ordinary dwarf galaxy.

Torre Yarwa said that the error in the distance formula made the RR Lair star about 260,000 light years away from the Earth instead of the original 424,000 light years. But they used two more methods to confirm the distance of the other stars in the "Ante-2". He said that a galaxy like "Ante-2" must have hundreds of variable stars and that this group is the closest. He also said that the new calculations did not change the strange nature of ı Ante-2 Ayrıca.

Alan McConaughey of Victoria University in Canada said, ışı To see the unusual part of the galaxy less unusual, the distance should be twice as large. If you change it to 10% or 20%, it is still a very strange object type. "

We know for a long time that "missing" galaxies are hidden behind the gas and dust of the Milky Way. There are also few equally scattered and scattered galaxies such as crater 2 and Andromeda 19. He said, "Whether it is the tip of a few extreme objects or the icebergs of a new galaxy species, that's the thing we need to know urgently."

If the report had been different from what the galaxy had been previously thought, if the galaxy had been surrounded by angry dwarf galaxies, people might have to rewrite the understanding of the dark matter spread in the universe and the star-gathering mechanism. (Compile / Hu Wei)

(Original title: Scientists say the galaxy conceals the gigantic ghost galaxies on the side of the Milky Way. British media: still no mystery)


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